package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServerImpl implements UserService {
    @Autowired
    private WeChatProperties properties;
    @Autowired
    private UserMapper userMapper;
    private final String Wx_Login="https://api.weixin.qq.com/sns/jscode2session";

    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    public User wxLogin(UserLoginDTO userLoginDTO) {
        String openid = getOpenid(userLoginDTO.getCode());
        //判断当前用appid是否为空
        if (openid ==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断是否是新用户
        User user = userMapper.getUserById(openid);
        //如果是新用户自动注册
        if (user == null){
            user= User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }
        return user;
    }

    /**
     * 获取openid
     * @param code
     * @return
     */
    private String getOpenid(String code){
        Map<String,String> map= new HashMap<>();
        map.put("appid",properties.getAppid());
        map.put("secret",properties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        //调用微信接口服务，获取用户得openid
        String json = HttpClientUtil.doGet(Wx_Login, map);
        JSONObject jsonObject = JSON.parseObject(json);
        return  jsonObject.getString("openid");
    }

}
